body {
    font-size: 62.5%;
}

div {
    border: 1px solid #000000;
    margin: 10px auto 20px auto;
    width: 99px;
    background-color: #CCCCCC;
    padding: 2px 2px 2px 2px;
}

.div_float {
    float: left;
}

.div_clear_left {
    clear: left;
}